On Wed, 1 Apr 2020 14:38:37 -0500 Matt Hoosier <matt.hoosier@xxxxxxxxx> wrote: > I'm searching for some sort of scheme that will let my DRI master query the > set of available connectors and select the one carrying a prearranged > designation. The problem I'm trying to solve is to allow deploying one > standardized userspace component across a fleet of devices that have > varying numbers of displays, with the use cases not always driven on the > same connector topologically. > > I had a look around the properties available on my system's DRI connectors, > and nothing immediate jumped out at me. Is there a standard connector > property that (assuming I can find the right place in DeviceTree or similar > to) that would be a good fit for this? Hi, I've never heard of a thing that could accomplish that. DRM connector names are not even actually communicated to userspace. What userspace sees is connector type (enum) and some counter numbers (which are not persistent, so not reliable if you have e.g. multiple DRM drivers racing to initialize), and then userspace manufactures a connector name from those. This has been most painful with Xorg, where the different video DDX drivers used to use different conventions in making up the names, meaning that if you switched DDXes (e.g. between driver-specific driver and modesetting driver), the connector names changed invalidating your xorg.conf. However, the problem of non-persistent connector names has been thought of, see e.g.: https://lists.freedesktop.org/archives/dri-devel/2019-June/221902.html The thread has messages also in July and August. If you had reliable, persistent connector names (and used e.g. device path from udev to reliably identify DRM devices), maybe you could build something on top of that? Though I doubt if maintainers would like your config to be in DT or kernel, maybe it needs to be handled in userspace? Thanks, pq
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